+++ /dev/null
-/*\r
- * Network proxy abstraction in PuTTY\r
- *\r
- * A proxy layer, if necessary, wedges itself between the network\r
- * code and the higher level backend.\r
- */\r
-\r
-#include <assert.h>\r
-#include <ctype.h>\r
-#include <string.h>\r
-\r
-#define DEFINE_PLUG_METHOD_MACROS\r
-#include "putty.h"\r
-#include "network.h"\r
-#include "proxy.h"\r
-\r
-#define do_proxy_dns(cfg) \\r
- (cfg->proxy_dns == FORCE_ON || \\r
- (cfg->proxy_dns == AUTO && cfg->proxy_type != PROXY_SOCKS4))\r
-\r
-/*\r
- * Call this when proxy negotiation is complete, so that this\r
- * socket can begin working normally.\r
- */\r
-void proxy_activate (Proxy_Socket p)\r
-{\r
- void *data;\r
- int len;\r
- long output_before, output_after;\r
- \r
- p->state = PROXY_STATE_ACTIVE;\r
-\r
- /* we want to ignore new receive events until we have sent\r
- * all of our buffered receive data.\r
- */\r
- sk_set_frozen(p->sub_socket, 1);\r
-\r
- /* how many bytes of output have we buffered? */\r
- output_before = bufchain_size(&p->pending_oob_output_data) +\r
- bufchain_size(&p->pending_output_data);\r
- /* and keep track of how many bytes do not get sent. */\r
- output_after = 0;\r
- \r
- /* send buffered OOB writes */\r
- while (bufchain_size(&p->pending_oob_output_data) > 0) {\r
- bufchain_prefix(&p->pending_oob_output_data, &data, &len);\r
- output_after += sk_write_oob(p->sub_socket, data, len);\r
- bufchain_consume(&p->pending_oob_output_data, len);\r
- }\r
-\r
- /* send buffered normal writes */\r
- while (bufchain_size(&p->pending_output_data) > 0) {\r
- bufchain_prefix(&p->pending_output_data, &data, &len);\r
- output_after += sk_write(p->sub_socket, data, len);\r
- bufchain_consume(&p->pending_output_data, len);\r
- }\r
-\r
- /* if we managed to send any data, let the higher levels know. */\r
- if (output_after < output_before)\r
- plug_sent(p->plug, output_after);\r
-\r
- /* if we were asked to flush the output during\r
- * the proxy negotiation process, do so now.\r
- */\r
- if (p->pending_flush) sk_flush(p->sub_socket);\r
-\r
- /* if the backend wanted the socket unfrozen, try to unfreeze.\r
- * our set_frozen handler will flush buffered receive data before\r
- * unfreezing the actual underlying socket.\r
- */\r
- if (!p->freeze)\r
- sk_set_frozen((Socket)p, 0);\r
-}\r
-\r
-/* basic proxy socket functions */\r
-\r
-static Plug sk_proxy_plug (Socket s, Plug p)\r
-{\r
- Proxy_Socket ps = (Proxy_Socket) s;\r
- Plug ret = ps->plug;\r
- if (p)\r
- ps->plug = p;\r
- return ret;\r
-}\r
-\r
-static void sk_proxy_close (Socket s)\r
-{\r
- Proxy_Socket ps = (Proxy_Socket) s;\r
-\r
- sk_close(ps->sub_socket);\r
- sk_addr_free(ps->remote_addr);\r
- sfree(ps);\r
-}\r
-\r
-static int sk_proxy_write (Socket s, const char *data, int len)\r
-{\r
- Proxy_Socket ps = (Proxy_Socket) s;\r
-\r
- if (ps->state != PROXY_STATE_ACTIVE) {\r
- bufchain_add(&ps->pending_output_data, data, len);\r
- return bufchain_size(&ps->pending_output_data);\r
- }\r
- return sk_write(ps->sub_socket, data, len);\r
-}\r
-\r
-static int sk_proxy_write_oob (Socket s, const char *data, int len)\r
-{\r
- Proxy_Socket ps = (Proxy_Socket) s;\r
-\r
- if (ps->state != PROXY_STATE_ACTIVE) {\r
- bufchain_clear(&ps->pending_output_data);\r
- bufchain_clear(&ps->pending_oob_output_data);\r
- bufchain_add(&ps->pending_oob_output_data, data, len);\r
- return len;\r
- }\r
- return sk_write_oob(ps->sub_socket, data, len);\r
-}\r
-\r
-static void sk_proxy_flush (Socket s)\r
-{\r
- Proxy_Socket ps = (Proxy_Socket) s;\r
-\r
- if (ps->state != PROXY_STATE_ACTIVE) {\r
- ps->pending_flush = 1;\r
- return;\r
- }\r
- sk_flush(ps->sub_socket);\r
-}\r
-\r
-static void sk_proxy_set_private_ptr (Socket s, void *ptr)\r
-{\r
- Proxy_Socket ps = (Proxy_Socket) s;\r
- sk_set_private_ptr(ps->sub_socket, ptr);\r
-}\r
-\r
-static void * sk_proxy_get_private_ptr (Socket s)\r
-{\r
- Proxy_Socket ps = (Proxy_Socket) s;\r
- return sk_get_private_ptr(ps->sub_socket);\r
-}\r
-\r
-static void sk_proxy_set_frozen (Socket s, int is_frozen)\r
-{\r
- Proxy_Socket ps = (Proxy_Socket) s;\r
-\r
- if (ps->state != PROXY_STATE_ACTIVE) {\r
- ps->freeze = is_frozen;\r
- return;\r
- }\r
- \r
- /* handle any remaining buffered recv data first */\r
- if (bufchain_size(&ps->pending_input_data) > 0) {\r
- ps->freeze = is_frozen;\r
-\r
- /* loop while we still have buffered data, and while we are\r
- * unfrozen. the plug_receive call in the loop could result \r
- * in a call back into this function refreezing the socket, \r
- * so we have to check each time.\r
- */\r
- while (!ps->freeze && bufchain_size(&ps->pending_input_data) > 0) {\r
- void *data;\r
- char databuf[512];\r
- int len;\r
- bufchain_prefix(&ps->pending_input_data, &data, &len);\r
- if (len > lenof(databuf))\r
- len = lenof(databuf);\r
- memcpy(databuf, data, len);\r
- bufchain_consume(&ps->pending_input_data, len);\r
- plug_receive(ps->plug, 0, databuf, len);\r
- }\r
-\r
- /* if we're still frozen, we'll have to wait for another\r
- * call from the backend to finish unbuffering the data.\r
- */\r
- if (ps->freeze) return;\r
- }\r
- \r
- sk_set_frozen(ps->sub_socket, is_frozen);\r
-}\r
-\r
-static const char * sk_proxy_socket_error (Socket s)\r
-{\r
- Proxy_Socket ps = (Proxy_Socket) s;\r
- if (ps->error != NULL || ps->sub_socket == NULL) {\r
- return ps->error;\r
- }\r
- return sk_socket_error(ps->sub_socket);\r
-}\r
-\r
-/* basic proxy plug functions */\r
-\r
-static void plug_proxy_log(Plug plug, int type, SockAddr addr, int port,\r
- const char *error_msg, int error_code)\r
-{\r
- Proxy_Plug pp = (Proxy_Plug) plug;\r
- Proxy_Socket ps = pp->proxy_socket;\r
-\r
- plug_log(ps->plug, type, addr, port, error_msg, error_code);\r
-}\r
-\r
-static int plug_proxy_closing (Plug p, const char *error_msg,\r
- int error_code, int calling_back)\r
-{\r
- Proxy_Plug pp = (Proxy_Plug) p;\r
- Proxy_Socket ps = pp->proxy_socket;\r
-\r
- if (ps->state != PROXY_STATE_ACTIVE) {\r
- ps->closing_error_msg = error_msg;\r
- ps->closing_error_code = error_code;\r
- ps->closing_calling_back = calling_back;\r
- return ps->negotiate(ps, PROXY_CHANGE_CLOSING);\r
- }\r
- return plug_closing(ps->plug, error_msg,\r
- error_code, calling_back);\r
-}\r
-\r
-static int plug_proxy_receive (Plug p, int urgent, char *data, int len)\r
-{\r
- Proxy_Plug pp = (Proxy_Plug) p;\r
- Proxy_Socket ps = pp->proxy_socket;\r
-\r
- if (ps->state != PROXY_STATE_ACTIVE) {\r
- /* we will lose the urgentness of this data, but since most,\r
- * if not all, of this data will be consumed by the negotiation\r
- * process, hopefully it won't affect the protocol above us\r
- */\r
- bufchain_add(&ps->pending_input_data, data, len);\r
- ps->receive_urgent = urgent;\r
- ps->receive_data = data;\r
- ps->receive_len = len;\r
- return ps->negotiate(ps, PROXY_CHANGE_RECEIVE);\r
- }\r
- return plug_receive(ps->plug, urgent, data, len);\r
-}\r
-\r
-static void plug_proxy_sent (Plug p, int bufsize)\r
-{\r
- Proxy_Plug pp = (Proxy_Plug) p;\r
- Proxy_Socket ps = pp->proxy_socket;\r
-\r
- if (ps->state != PROXY_STATE_ACTIVE) {\r
- ps->sent_bufsize = bufsize;\r
- ps->negotiate(ps, PROXY_CHANGE_SENT);\r
- return;\r
- }\r
- plug_sent(ps->plug, bufsize);\r
-}\r
-\r
-static int plug_proxy_accepting (Plug p, OSSocket sock)\r
-{\r
- Proxy_Plug pp = (Proxy_Plug) p;\r
- Proxy_Socket ps = pp->proxy_socket;\r
-\r
- if (ps->state != PROXY_STATE_ACTIVE) {\r
- ps->accepting_sock = sock;\r
- return ps->negotiate(ps, PROXY_CHANGE_ACCEPTING);\r
- }\r
- return plug_accepting(ps->plug, sock);\r
-}\r
-\r
-/*\r
- * This function can accept a NULL pointer as `addr', in which case\r
- * it will only check the host name.\r
- */\r
-static int proxy_for_destination (SockAddr addr, char *hostname, int port,\r
- const Config *cfg)\r
-{\r
- int s = 0, e = 0;\r
- char hostip[64];\r
- int hostip_len, hostname_len;\r
- const char *exclude_list;\r
-\r
- /*\r
- * Check the host name and IP against the hard-coded\r
- * representations of `localhost'.\r
- */\r
- if (!cfg->even_proxy_localhost &&\r
- (sk_hostname_is_local(hostname) ||\r
- (addr && sk_address_is_local(addr))))\r
- return 0; /* do not proxy */\r
-\r
- /* we want a string representation of the IP address for comparisons */\r
- if (addr) {\r
- sk_getaddr(addr, hostip, 64);\r
- hostip_len = strlen(hostip);\r
- } else\r
- hostip_len = 0; /* placate gcc; shouldn't be required */\r
-\r
- hostname_len = strlen(hostname);\r
-\r
- exclude_list = cfg->proxy_exclude_list;\r
-\r
- /* now parse the exclude list, and see if either our IP\r
- * or hostname matches anything in it.\r
- */\r
-\r
- while (exclude_list[s]) {\r
- while (exclude_list[s] &&\r
- (isspace((unsigned char)exclude_list[s]) ||\r
- exclude_list[s] == ',')) s++;\r
-\r
- if (!exclude_list[s]) break;\r
-\r
- e = s;\r
-\r
- while (exclude_list[e] &&\r
- (isalnum((unsigned char)exclude_list[e]) ||\r
- exclude_list[e] == '-' ||\r
- exclude_list[e] == '.' ||\r
- exclude_list[e] == '*')) e++;\r
-\r
- if (exclude_list[s] == '*') {\r
- /* wildcard at beginning of entry */\r
-\r
- if ((addr && strnicmp(hostip + hostip_len - (e - s - 1),\r
- exclude_list + s + 1, e - s - 1) == 0) ||\r
- strnicmp(hostname + hostname_len - (e - s - 1),\r
- exclude_list + s + 1, e - s - 1) == 0)\r
- return 0; /* IP/hostname range excluded. do not use proxy. */\r
-\r
- } else if (exclude_list[e-1] == '*') {\r
- /* wildcard at end of entry */\r
-\r
- if ((addr && strnicmp(hostip, exclude_list + s, e - s - 1) == 0) ||\r
- strnicmp(hostname, exclude_list + s, e - s - 1) == 0)\r
- return 0; /* IP/hostname range excluded. do not use proxy. */\r
-\r
- } else {\r
- /* no wildcard at either end, so let's try an absolute\r
- * match (ie. a specific IP)\r
- */\r
-\r
- if (addr && strnicmp(hostip, exclude_list + s, e - s) == 0)\r
- return 0; /* IP/hostname excluded. do not use proxy. */\r
- if (strnicmp(hostname, exclude_list + s, e - s) == 0)\r
- return 0; /* IP/hostname excluded. do not use proxy. */\r
- }\r
-\r
- s = e;\r
-\r
- /* Make sure we really have reached the next comma or end-of-string */\r
- while (exclude_list[s] &&\r
- !isspace((unsigned char)exclude_list[s]) &&\r
- exclude_list[s] != ',') s++;\r
- }\r
-\r
- /* no matches in the exclude list, so use the proxy */\r
- return 1;\r
-}\r
-\r
-SockAddr name_lookup(char *host, int port, char **canonicalname,\r
- const Config *cfg, int addressfamily)\r
-{\r
- if (cfg->proxy_type != PROXY_NONE &&\r
- do_proxy_dns(cfg) &&\r
- proxy_for_destination(NULL, host, port, cfg)) {\r
- *canonicalname = dupstr(host);\r
- return sk_nonamelookup(host);\r
- }\r
-\r
- return sk_namelookup(host, canonicalname, addressfamily);\r
-}\r
-\r
-Socket new_connection(SockAddr addr, char *hostname,\r
- int port, int privport,\r
- int oobinline, int nodelay, int keepalive,\r
- Plug plug, const Config *cfg)\r
-{\r
- static const struct socket_function_table socket_fn_table = {\r
- sk_proxy_plug,\r
- sk_proxy_close,\r
- sk_proxy_write,\r
- sk_proxy_write_oob,\r
- sk_proxy_flush,\r
- sk_proxy_set_private_ptr,\r
- sk_proxy_get_private_ptr,\r
- sk_proxy_set_frozen,\r
- sk_proxy_socket_error\r
- };\r
-\r
- static const struct plug_function_table plug_fn_table = {\r
- plug_proxy_log,\r
- plug_proxy_closing,\r
- plug_proxy_receive,\r
- plug_proxy_sent,\r
- plug_proxy_accepting\r
- };\r
-\r
- if (cfg->proxy_type != PROXY_NONE &&\r
- proxy_for_destination(addr, hostname, port, cfg))\r
- {\r
- Proxy_Socket ret;\r
- Proxy_Plug pplug;\r
- SockAddr proxy_addr;\r
- char *proxy_canonical_name;\r
- Socket sret;\r
-\r
- if ((sret = platform_new_connection(addr, hostname, port, privport,\r
- oobinline, nodelay, keepalive,\r
- plug, cfg)) !=\r
- NULL)\r
- return sret;\r
-\r
- ret = snew(struct Socket_proxy_tag);\r
- ret->fn = &socket_fn_table;\r
- ret->cfg = *cfg; /* STRUCTURE COPY */\r
- ret->plug = plug;\r
- ret->remote_addr = addr; /* will need to be freed on close */\r
- ret->remote_port = port;\r
-\r
- ret->error = NULL;\r
- ret->pending_flush = 0;\r
- ret->freeze = 0;\r
-\r
- bufchain_init(&ret->pending_input_data);\r
- bufchain_init(&ret->pending_output_data);\r
- bufchain_init(&ret->pending_oob_output_data);\r
-\r
- ret->sub_socket = NULL;\r
- ret->state = PROXY_STATE_NEW;\r
- ret->negotiate = NULL;\r
- \r
- if (cfg->proxy_type == PROXY_HTTP) {\r
- ret->negotiate = proxy_http_negotiate;\r
- } else if (cfg->proxy_type == PROXY_SOCKS4) {\r
- ret->negotiate = proxy_socks4_negotiate;\r
- } else if (cfg->proxy_type == PROXY_SOCKS5) {\r
- ret->negotiate = proxy_socks5_negotiate;\r
- } else if (cfg->proxy_type == PROXY_TELNET) {\r
- ret->negotiate = proxy_telnet_negotiate;\r
- } else {\r
- ret->error = "Proxy error: Unknown proxy method";\r
- return (Socket) ret;\r
- }\r
-\r
- /* create the proxy plug to map calls from the actual\r
- * socket into our proxy socket layer */\r
- pplug = snew(struct Plug_proxy_tag);\r
- pplug->fn = &plug_fn_table;\r
- pplug->proxy_socket = ret;\r
-\r
- /* look-up proxy */\r
- proxy_addr = sk_namelookup(cfg->proxy_host,\r
- &proxy_canonical_name, cfg->addressfamily);\r
- if (sk_addr_error(proxy_addr) != NULL) {\r
- ret->error = "Proxy error: Unable to resolve proxy host name";\r
- return (Socket)ret;\r
- }\r
- sfree(proxy_canonical_name);\r
-\r
- /* create the actual socket we will be using,\r
- * connected to our proxy server and port.\r
- */\r
- ret->sub_socket = sk_new(proxy_addr, cfg->proxy_port,\r
- privport, oobinline,\r
- nodelay, keepalive, (Plug) pplug);\r
- if (sk_socket_error(ret->sub_socket) != NULL)\r
- return (Socket) ret;\r
-\r
- /* start the proxy negotiation process... */\r
- sk_set_frozen(ret->sub_socket, 0);\r
- ret->negotiate(ret, PROXY_CHANGE_NEW);\r
-\r
- return (Socket) ret;\r
- }\r
-\r
- /* no proxy, so just return the direct socket */\r
- return sk_new(addr, port, privport, oobinline, nodelay, keepalive, plug);\r
-}\r
-\r
-Socket new_listener(char *srcaddr, int port, Plug plug, int local_host_only,\r
- const Config *cfg, int addressfamily)\r
-{\r
- /* TODO: SOCKS (and potentially others) support inbound\r
- * TODO: connections via the proxy. support them.\r
- */\r
-\r
- return sk_newlistener(srcaddr, port, plug, local_host_only, addressfamily);\r
-}\r
-\r
-/* ----------------------------------------------------------------------\r
- * HTTP CONNECT proxy type.\r
- */\r
-\r
-static int get_line_end (char * data, int len)\r
-{\r
- int off = 0;\r
-\r
- while (off < len)\r
- {\r
- if (data[off] == '\n') {\r
- /* we have a newline */\r
- off++;\r
-\r
- /* is that the only thing on this line? */\r
- if (off <= 2) return off;\r
-\r
- /* if not, then there is the possibility that this header\r
- * continues onto the next line, if it starts with a space\r
- * or a tab.\r
- */\r
-\r
- if (off + 1 < len &&\r
- data[off+1] != ' ' &&\r
- data[off+1] != '\t') return off;\r
-\r
- /* the line does continue, so we have to keep going\r
- * until we see an the header's "real" end of line.\r
- */\r
- off++;\r
- }\r
-\r
- off++;\r
- }\r
-\r
- return -1;\r
-}\r
-\r
-int proxy_http_negotiate (Proxy_Socket p, int change)\r
-{\r
- if (p->state == PROXY_STATE_NEW) {\r
- /* we are just beginning the proxy negotiate process,\r
- * so we'll send off the initial bits of the request.\r
- * for this proxy method, it's just a simple HTTP\r
- * request\r
- */\r
- char *buf, dest[512];\r
-\r
- sk_getaddr(p->remote_addr, dest, lenof(dest));\r
-\r
- buf = dupprintf("CONNECT %s:%i HTTP/1.1\r\nHost: %s:%i\r\n",\r
- dest, p->remote_port, dest, p->remote_port);\r
- sk_write(p->sub_socket, buf, strlen(buf));\r
- sfree(buf);\r
-\r
- if (p->cfg.proxy_username[0] || p->cfg.proxy_password[0]) {\r
- char buf[sizeof(p->cfg.proxy_username)+sizeof(p->cfg.proxy_password)];\r
- char buf2[sizeof(buf)*4/3 + 100];\r
- int i, j, len;\r
- sprintf(buf, "%s:%s", p->cfg.proxy_username, p->cfg.proxy_password);\r
- len = strlen(buf);\r
- sprintf(buf2, "Proxy-Authorization: Basic ");\r
- for (i = 0, j = strlen(buf2); i < len; i += 3, j += 4)\r
- base64_encode_atom((unsigned char *)(buf+i),\r
- (len-i > 3 ? 3 : len-i), buf2+j);\r
- strcpy(buf2+j, "\r\n");\r
- sk_write(p->sub_socket, buf2, strlen(buf2));\r
- }\r
-\r
- sk_write(p->sub_socket, "\r\n", 2);\r
-\r
- p->state = 1;\r
- return 0;\r
- }\r
-\r
- if (change == PROXY_CHANGE_CLOSING) {\r
- /* if our proxy negotiation process involves closing and opening\r
- * new sockets, then we would want to intercept this closing\r
- * callback when we were expecting it. if we aren't anticipating\r
- * a socket close, then some error must have occurred. we'll\r
- * just pass those errors up to the backend.\r
- */\r
- return plug_closing(p->plug, p->closing_error_msg,\r
- p->closing_error_code,\r
- p->closing_calling_back);\r
- }\r
-\r
- if (change == PROXY_CHANGE_SENT) {\r
- /* some (or all) of what we wrote to the proxy was sent.\r
- * we don't do anything new, however, until we receive the\r
- * proxy's response. we might want to set a timer so we can\r
- * timeout the proxy negotiation after a while...\r
- */\r
- return 0;\r
- }\r
-\r
- if (change == PROXY_CHANGE_ACCEPTING) {\r
- /* we should _never_ see this, as we are using our socket to\r
- * connect to a proxy, not accepting inbound connections.\r
- * what should we do? close the socket with an appropriate\r
- * error message?\r
- */\r
- return plug_accepting(p->plug, p->accepting_sock);\r
- }\r
-\r
- if (change == PROXY_CHANGE_RECEIVE) {\r
- /* we have received data from the underlying socket, which\r
- * we'll need to parse, process, and respond to appropriately.\r
- */\r
-\r
- char *data, *datap;\r
- int len;\r
- int eol;\r
-\r
- if (p->state == 1) {\r
-\r
- int min_ver, maj_ver, status;\r
-\r
- /* get the status line */\r
- len = bufchain_size(&p->pending_input_data);\r
- assert(len > 0); /* or we wouldn't be here */\r
- data = snewn(len+1, char);\r
- bufchain_fetch(&p->pending_input_data, data, len);\r
- /*\r
- * We must NUL-terminate this data, because Windows\r
- * sscanf appears to require a NUL at the end of the\r
- * string because it strlens it _first_. Sigh.\r
- */\r
- data[len] = '\0';\r
-\r
- eol = get_line_end(data, len);\r
- if (eol < 0) {\r
- sfree(data);\r
- return 1;\r
- }\r
-\r
- status = -1;\r
- /* We can't rely on whether the %n incremented the sscanf return */\r
- if (sscanf((char *)data, "HTTP/%i.%i %n",\r
- &maj_ver, &min_ver, &status) < 2 || status == -1) {\r
- plug_closing(p->plug, "Proxy error: HTTP response was absent",\r
- PROXY_ERROR_GENERAL, 0);\r
- sfree(data);\r
- return 1;\r
- }\r
-\r
- /* remove the status line from the input buffer. */\r
- bufchain_consume(&p->pending_input_data, eol);\r
- if (data[status] != '2') {\r
- /* error */\r
- char *buf;\r
- data[eol] = '\0';\r
- while (eol > status &&\r
- (data[eol-1] == '\r' || data[eol-1] == '\n'))\r
- data[--eol] = '\0';\r
- buf = dupprintf("Proxy error: %s", data+status);\r
- plug_closing(p->plug, buf, PROXY_ERROR_GENERAL, 0);\r
- sfree(buf);\r
- sfree(data);\r
- return 1;\r
- }\r
-\r
- sfree(data);\r
-\r
- p->state = 2;\r
- }\r
-\r
- if (p->state == 2) {\r
-\r
- /* get headers. we're done when we get a\r
- * header of length 2, (ie. just "\r\n")\r
- */\r
-\r
- len = bufchain_size(&p->pending_input_data);\r
- assert(len > 0); /* or we wouldn't be here */\r
- data = snewn(len, char);\r
- datap = data;\r
- bufchain_fetch(&p->pending_input_data, data, len);\r
-\r
- eol = get_line_end(datap, len);\r
- if (eol < 0) {\r
- sfree(data);\r
- return 1;\r
- }\r
- while (eol > 2)\r
- {\r
- bufchain_consume(&p->pending_input_data, eol);\r
- datap += eol;\r
- len -= eol;\r
- eol = get_line_end(datap, len);\r
- }\r
-\r
- if (eol == 2) {\r
- /* we're done */\r
- bufchain_consume(&p->pending_input_data, 2);\r
- proxy_activate(p);\r
- /* proxy activate will have dealt with\r
- * whatever is left of the buffer */\r
- sfree(data);\r
- return 1;\r
- }\r
-\r
- sfree(data);\r
- return 1;\r
- }\r
- }\r
-\r
- plug_closing(p->plug, "Proxy error: unexpected proxy error",\r
- PROXY_ERROR_UNEXPECTED, 0);\r
- return 1;\r
-}\r
-\r
-/* ----------------------------------------------------------------------\r
- * SOCKS proxy type.\r
- */\r
-\r
-/* SOCKS version 4 */\r
-int proxy_socks4_negotiate (Proxy_Socket p, int change)\r
-{\r
- if (p->state == PROXY_CHANGE_NEW) {\r
-\r
- /* request format:\r
- * version number (1 byte) = 4\r
- * command code (1 byte)\r
- * 1 = CONNECT\r
- * 2 = BIND\r
- * dest. port (2 bytes) [network order]\r
- * dest. address (4 bytes)\r
- * user ID (variable length, null terminated string)\r
- */\r
-\r
- int length, type, namelen;\r
- char *command, addr[4], hostname[512];\r
-\r
- type = sk_addrtype(p->remote_addr);\r
- if (type == ADDRTYPE_IPV6) {\r
- plug_closing(p->plug, "Proxy error: SOCKS version 4 does"\r
- " not support IPv6", PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- } else if (type == ADDRTYPE_IPV4) {\r
- namelen = 0;\r
- sk_addrcopy(p->remote_addr, addr);\r
- } else { /* type == ADDRTYPE_NAME */\r
- assert(type == ADDRTYPE_NAME);\r
- sk_getaddr(p->remote_addr, hostname, lenof(hostname));\r
- namelen = strlen(hostname) + 1; /* include the NUL */\r
- addr[0] = addr[1] = addr[2] = 0;\r
- addr[3] = 1;\r
- }\r
-\r
- length = strlen(p->cfg.proxy_username) + namelen + 9;\r
- command = snewn(length, char);\r
- strcpy(command + 8, p->cfg.proxy_username);\r
-\r
- command[0] = 4; /* version 4 */\r
- command[1] = 1; /* CONNECT command */\r
-\r
- /* port */\r
- command[2] = (char) (p->remote_port >> 8) & 0xff;\r
- command[3] = (char) p->remote_port & 0xff;\r
-\r
- /* address */\r
- memcpy(command + 4, addr, 4);\r
-\r
- /* hostname */\r
- memcpy(command + 8 + strlen(p->cfg.proxy_username) + 1,\r
- hostname, namelen);\r
-\r
- sk_write(p->sub_socket, command, length);\r
- sfree(command);\r
-\r
- p->state = 1;\r
- return 0;\r
- }\r
-\r
- if (change == PROXY_CHANGE_CLOSING) {\r
- /* if our proxy negotiation process involves closing and opening\r
- * new sockets, then we would want to intercept this closing\r
- * callback when we were expecting it. if we aren't anticipating\r
- * a socket close, then some error must have occurred. we'll\r
- * just pass those errors up to the backend.\r
- */\r
- return plug_closing(p->plug, p->closing_error_msg,\r
- p->closing_error_code,\r
- p->closing_calling_back);\r
- }\r
-\r
- if (change == PROXY_CHANGE_SENT) {\r
- /* some (or all) of what we wrote to the proxy was sent.\r
- * we don't do anything new, however, until we receive the\r
- * proxy's response. we might want to set a timer so we can\r
- * timeout the proxy negotiation after a while...\r
- */\r
- return 0;\r
- }\r
-\r
- if (change == PROXY_CHANGE_ACCEPTING) {\r
- /* we should _never_ see this, as we are using our socket to\r
- * connect to a proxy, not accepting inbound connections.\r
- * what should we do? close the socket with an appropriate\r
- * error message?\r
- */\r
- return plug_accepting(p->plug, p->accepting_sock);\r
- }\r
-\r
- if (change == PROXY_CHANGE_RECEIVE) {\r
- /* we have received data from the underlying socket, which\r
- * we'll need to parse, process, and respond to appropriately.\r
- */\r
-\r
- if (p->state == 1) {\r
- /* response format:\r
- * version number (1 byte) = 4\r
- * reply code (1 byte)\r
- * 90 = request granted\r
- * 91 = request rejected or failed\r
- * 92 = request rejected due to lack of IDENTD on client\r
- * 93 = request rejected due to difference in user ID \r
- * (what we sent vs. what IDENTD said)\r
- * dest. port (2 bytes)\r
- * dest. address (4 bytes)\r
- */\r
-\r
- char data[8];\r
-\r
- if (bufchain_size(&p->pending_input_data) < 8)\r
- return 1; /* not got anything yet */\r
- \r
- /* get the response */\r
- bufchain_fetch(&p->pending_input_data, data, 8);\r
-\r
- if (data[0] != 0) {\r
- plug_closing(p->plug, "Proxy error: SOCKS proxy responded with "\r
- "unexpected reply code version",\r
- PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- }\r
-\r
- if (data[1] != 90) {\r
-\r
- switch (data[1]) {\r
- case 92:\r
- plug_closing(p->plug, "Proxy error: SOCKS server wanted IDENTD on client",\r
- PROXY_ERROR_GENERAL, 0);\r
- break;\r
- case 93:\r
- plug_closing(p->plug, "Proxy error: Username and IDENTD on client don't agree",\r
- PROXY_ERROR_GENERAL, 0);\r
- break;\r
- case 91:\r
- default:\r
- plug_closing(p->plug, "Proxy error: Error while communicating with proxy",\r
- PROXY_ERROR_GENERAL, 0);\r
- break;\r
- }\r
-\r
- return 1;\r
- }\r
- bufchain_consume(&p->pending_input_data, 8);\r
-\r
- /* we're done */\r
- proxy_activate(p);\r
- /* proxy activate will have dealt with\r
- * whatever is left of the buffer */\r
- return 1;\r
- }\r
- }\r
-\r
- plug_closing(p->plug, "Proxy error: unexpected proxy error",\r
- PROXY_ERROR_UNEXPECTED, 0);\r
- return 1;\r
-}\r
-\r
-/* SOCKS version 5 */\r
-int proxy_socks5_negotiate (Proxy_Socket p, int change)\r
-{\r
- if (p->state == PROXY_CHANGE_NEW) {\r
-\r
- /* initial command:\r
- * version number (1 byte) = 5\r
- * number of available authentication methods (1 byte)\r
- * available authentication methods (1 byte * previous value)\r
- * authentication methods:\r
- * 0x00 = no authentication\r
- * 0x01 = GSSAPI\r
- * 0x02 = username/password\r
- * 0x03 = CHAP\r
- */\r
-\r
- char command[5];\r
- int len;\r
-\r
- command[0] = 5; /* version 5 */\r
- if (p->cfg.proxy_username[0] || p->cfg.proxy_password[0]) {\r
- command[2] = 0x00; /* no authentication */\r
- len = 3;\r
- proxy_socks5_offerencryptedauth (command, &len);\r
- command[len++] = 0x02; /* username/password */\r
- command[1] = len - 2; /* Number of methods supported */\r
- } else {\r
- command[1] = 1; /* one methods supported: */\r
- command[2] = 0x00; /* no authentication */\r
- len = 3;\r
- }\r
-\r
- sk_write(p->sub_socket, command, len);\r
-\r
- p->state = 1;\r
- return 0;\r
- }\r
-\r
- if (change == PROXY_CHANGE_CLOSING) {\r
- /* if our proxy negotiation process involves closing and opening\r
- * new sockets, then we would want to intercept this closing\r
- * callback when we were expecting it. if we aren't anticipating\r
- * a socket close, then some error must have occurred. we'll\r
- * just pass those errors up to the backend.\r
- */\r
- return plug_closing(p->plug, p->closing_error_msg,\r
- p->closing_error_code,\r
- p->closing_calling_back);\r
- }\r
-\r
- if (change == PROXY_CHANGE_SENT) {\r
- /* some (or all) of what we wrote to the proxy was sent.\r
- * we don't do anything new, however, until we receive the\r
- * proxy's response. we might want to set a timer so we can\r
- * timeout the proxy negotiation after a while...\r
- */\r
- return 0;\r
- }\r
-\r
- if (change == PROXY_CHANGE_ACCEPTING) {\r
- /* we should _never_ see this, as we are using our socket to\r
- * connect to a proxy, not accepting inbound connections.\r
- * what should we do? close the socket with an appropriate\r
- * error message?\r
- */\r
- return plug_accepting(p->plug, p->accepting_sock);\r
- }\r
-\r
- if (change == PROXY_CHANGE_RECEIVE) {\r
- /* we have received data from the underlying socket, which\r
- * we'll need to parse, process, and respond to appropriately.\r
- */\r
-\r
- if (p->state == 1) {\r
-\r
- /* initial response:\r
- * version number (1 byte) = 5\r
- * authentication method (1 byte)\r
- * authentication methods:\r
- * 0x00 = no authentication\r
- * 0x01 = GSSAPI\r
- * 0x02 = username/password\r
- * 0x03 = CHAP\r
- * 0xff = no acceptable methods\r
- */\r
- char data[2];\r
-\r
- if (bufchain_size(&p->pending_input_data) < 2)\r
- return 1; /* not got anything yet */\r
-\r
- /* get the response */\r
- bufchain_fetch(&p->pending_input_data, data, 2);\r
-\r
- if (data[0] != 5) {\r
- plug_closing(p->plug, "Proxy error: SOCKS proxy returned unexpected version",\r
- PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- }\r
-\r
- if (data[1] == 0x00) p->state = 2; /* no authentication needed */\r
- else if (data[1] == 0x01) p->state = 4; /* GSSAPI authentication */\r
- else if (data[1] == 0x02) p->state = 5; /* username/password authentication */\r
- else if (data[1] == 0x03) p->state = 6; /* CHAP authentication */\r
- else {\r
- plug_closing(p->plug, "Proxy error: SOCKS proxy did not accept our authentication",\r
- PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- }\r
- bufchain_consume(&p->pending_input_data, 2);\r
- }\r
-\r
- if (p->state == 7) {\r
-\r
- /* password authentication reply format:\r
- * version number (1 bytes) = 1\r
- * reply code (1 byte)\r
- * 0 = succeeded\r
- * >0 = failed\r
- */\r
- char data[2];\r
-\r
- if (bufchain_size(&p->pending_input_data) < 2)\r
- return 1; /* not got anything yet */\r
-\r
- /* get the response */\r
- bufchain_fetch(&p->pending_input_data, data, 2);\r
-\r
- if (data[0] != 1) {\r
- plug_closing(p->plug, "Proxy error: SOCKS password "\r
- "subnegotiation contained wrong version number",\r
- PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- }\r
-\r
- if (data[1] != 0) {\r
-\r
- plug_closing(p->plug, "Proxy error: SOCKS proxy refused"\r
- " password authentication",\r
- PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- }\r
-\r
- bufchain_consume(&p->pending_input_data, 2);\r
- p->state = 2; /* now proceed as authenticated */\r
- }\r
-\r
- if (p->state == 8) {\r
- int ret;\r
- ret = proxy_socks5_handlechap(p);\r
- if (ret) return ret;\r
- }\r
-\r
- if (p->state == 2) {\r
-\r
- /* request format:\r
- * version number (1 byte) = 5\r
- * command code (1 byte)\r
- * 1 = CONNECT\r
- * 2 = BIND\r
- * 3 = UDP ASSOCIATE\r
- * reserved (1 byte) = 0x00\r
- * address type (1 byte)\r
- * 1 = IPv4\r
- * 3 = domainname (first byte has length, no terminating null)\r
- * 4 = IPv6\r
- * dest. address (variable)\r
- * dest. port (2 bytes) [network order]\r
- */\r
-\r
- char command[512];\r
- int len;\r
- int type;\r
-\r
- type = sk_addrtype(p->remote_addr);\r
- if (type == ADDRTYPE_IPV4) {\r
- len = 10; /* 4 hdr + 4 addr + 2 trailer */\r
- command[3] = 1; /* IPv4 */\r
- sk_addrcopy(p->remote_addr, command+4);\r
- } else if (type == ADDRTYPE_IPV6) {\r
- len = 22; /* 4 hdr + 16 addr + 2 trailer */\r
- command[3] = 4; /* IPv6 */\r
- sk_addrcopy(p->remote_addr, command+4);\r
- } else {\r
- assert(type == ADDRTYPE_NAME);\r
- command[3] = 3;\r
- sk_getaddr(p->remote_addr, command+5, 256);\r
- command[4] = strlen(command+5);\r
- len = 7 + command[4]; /* 4 hdr, 1 len, N addr, 2 trailer */\r
- }\r
-\r
- command[0] = 5; /* version 5 */\r
- command[1] = 1; /* CONNECT command */\r
- command[2] = 0x00;\r
-\r
- /* port */\r
- command[len-2] = (char) (p->remote_port >> 8) & 0xff;\r
- command[len-1] = (char) p->remote_port & 0xff;\r
-\r
- sk_write(p->sub_socket, command, len);\r
-\r
- p->state = 3;\r
- return 1;\r
- }\r
-\r
- if (p->state == 3) {\r
-\r
- /* reply format:\r
- * version number (1 bytes) = 5\r
- * reply code (1 byte)\r
- * 0 = succeeded\r
- * 1 = general SOCKS server failure\r
- * 2 = connection not allowed by ruleset\r
- * 3 = network unreachable\r
- * 4 = host unreachable\r
- * 5 = connection refused\r
- * 6 = TTL expired\r
- * 7 = command not supported\r
- * 8 = address type not supported\r
- * reserved (1 byte) = x00\r
- * address type (1 byte)\r
- * 1 = IPv4\r
- * 3 = domainname (first byte has length, no terminating null)\r
- * 4 = IPv6\r
- * server bound address (variable)\r
- * server bound port (2 bytes) [network order]\r
- */\r
- char data[5];\r
- int len;\r
-\r
- /* First 5 bytes of packet are enough to tell its length. */ \r
- if (bufchain_size(&p->pending_input_data) < 5)\r
- return 1; /* not got anything yet */\r
-\r
- /* get the response */\r
- bufchain_fetch(&p->pending_input_data, data, 5);\r
-\r
- if (data[0] != 5) {\r
- plug_closing(p->plug, "Proxy error: SOCKS proxy returned wrong version number",\r
- PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- }\r
-\r
- if (data[1] != 0) {\r
- char buf[256];\r
-\r
- strcpy(buf, "Proxy error: ");\r
-\r
- switch (data[1]) {\r
- case 1: strcat(buf, "General SOCKS server failure"); break;\r
- case 2: strcat(buf, "Connection not allowed by ruleset"); break;\r
- case 3: strcat(buf, "Network unreachable"); break;\r
- case 4: strcat(buf, "Host unreachable"); break;\r
- case 5: strcat(buf, "Connection refused"); break;\r
- case 6: strcat(buf, "TTL expired"); break;\r
- case 7: strcat(buf, "Command not supported"); break;\r
- case 8: strcat(buf, "Address type not supported"); break;\r
- default: sprintf(buf+strlen(buf),\r
- "Unrecognised SOCKS error code %d",\r
- data[1]);\r
- break;\r
- }\r
- plug_closing(p->plug, buf, PROXY_ERROR_GENERAL, 0);\r
-\r
- return 1;\r
- }\r
-\r
- /*\r
- * Eat the rest of the reply packet.\r
- */\r
- len = 6; /* first 4 bytes, last 2 */\r
- switch (data[3]) {\r
- case 1: len += 4; break; /* IPv4 address */\r
- case 4: len += 16; break;/* IPv6 address */\r
- case 3: len += (unsigned char)data[4]; break; /* domain name */\r
- default:\r
- plug_closing(p->plug, "Proxy error: SOCKS proxy returned "\r
- "unrecognised address format",\r
- PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- }\r
- if (bufchain_size(&p->pending_input_data) < len)\r
- return 1; /* not got whole reply yet */\r
- bufchain_consume(&p->pending_input_data, len);\r
-\r
- /* we're done */\r
- proxy_activate(p);\r
- return 1;\r
- }\r
-\r
- if (p->state == 4) {\r
- /* TODO: Handle GSSAPI authentication */\r
- plug_closing(p->plug, "Proxy error: We don't support GSSAPI authentication",\r
- PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- }\r
-\r
- if (p->state == 5) {\r
- if (p->cfg.proxy_username[0] || p->cfg.proxy_password[0]) {\r
- char userpwbuf[514];\r
- int ulen, plen;\r
- ulen = strlen(p->cfg.proxy_username);\r
- if (ulen > 255) ulen = 255; if (ulen < 1) ulen = 1;\r
- plen = strlen(p->cfg.proxy_password);\r
- if (plen > 255) plen = 255; if (plen < 1) plen = 1;\r
- userpwbuf[0] = 1; /* version number of subnegotiation */\r
- userpwbuf[1] = ulen;\r
- memcpy(userpwbuf+2, p->cfg.proxy_username, ulen);\r
- userpwbuf[ulen+2] = plen;\r
- memcpy(userpwbuf+ulen+3, p->cfg.proxy_password, plen);\r
- sk_write(p->sub_socket, userpwbuf, ulen + plen + 3);\r
- p->state = 7;\r
- } else \r
- plug_closing(p->plug, "Proxy error: Server chose "\r
- "username/password authentication but we "\r
- "didn't offer it!",\r
- PROXY_ERROR_GENERAL, 0);\r
- return 1;\r
- }\r
-\r
- if (p->state == 6) {\r
- int ret;\r
- ret = proxy_socks5_selectchap(p);\r
- if (ret) return ret;\r
- }\r
-\r
- }\r
-\r
- plug_closing(p->plug, "Proxy error: Unexpected proxy error",\r
- PROXY_ERROR_UNEXPECTED, 0);\r
- return 1;\r
-}\r
-\r
-/* ----------------------------------------------------------------------\r
- * `Telnet' proxy type.\r
- *\r
- * (This is for ad-hoc proxies where you connect to the proxy's\r
- * telnet port and send a command such as `connect host port'. The\r
- * command is configurable, since this proxy type is typically not\r
- * standardised or at all well-defined.)\r
- */\r
-\r
-char *format_telnet_command(SockAddr addr, int port, const Config *cfg)\r
-{\r
- char *ret = NULL;\r
- int retlen = 0, retsize = 0;\r
- int so = 0, eo = 0;\r
-#define ENSURE(n) do { \\r
- if (retsize < retlen + n) { \\r
- retsize = retlen + n + 512; \\r
- ret = sresize(ret, retsize, char); \\r
- } \\r
-} while (0)\r
-\r
- /* we need to escape \\, \%, \r, \n, \t, \x??, \0???, \r
- * %%, %host, %port, %user, and %pass\r
- */\r
-\r
- while (cfg->proxy_telnet_command[eo] != 0) {\r
-\r
- /* scan forward until we hit end-of-line,\r
- * or an escape character (\ or %) */\r
- while (cfg->proxy_telnet_command[eo] != 0 &&\r
- cfg->proxy_telnet_command[eo] != '%' &&\r
- cfg->proxy_telnet_command[eo] != '\\') eo++;\r
-\r
- /* if we hit eol, break out of our escaping loop */\r
- if (cfg->proxy_telnet_command[eo] == 0) break;\r
-\r
- /* if there was any unescaped text before the escape\r
- * character, send that now */\r
- if (eo != so) {\r
- ENSURE(eo - so);\r
- memcpy(ret + retlen, cfg->proxy_telnet_command + so, eo - so);\r
- retlen += eo - so;\r
- }\r
-\r
- so = eo++;\r
-\r
- /* if the escape character was the last character of\r
- * the line, we'll just stop and send it. */\r
- if (cfg->proxy_telnet_command[eo] == 0) break;\r
-\r
- if (cfg->proxy_telnet_command[so] == '\\') {\r
-\r
- /* we recognize \\, \%, \r, \n, \t, \x??.\r
- * anything else, we just send unescaped (including the \).\r
- */\r
-\r
- switch (cfg->proxy_telnet_command[eo]) {\r
-\r
- case '\\':\r
- ENSURE(1);\r
- ret[retlen++] = '\\';\r
- eo++;\r
- break;\r
-\r
- case '%':\r
- ENSURE(1);\r
- ret[retlen++] = '%';\r
- eo++;\r
- break;\r
-\r
- case 'r':\r
- ENSURE(1);\r
- ret[retlen++] = '\r';\r
- eo++;\r
- break;\r
-\r
- case 'n':\r
- ENSURE(1);\r
- ret[retlen++] = '\n';\r
- eo++;\r
- break;\r
-\r
- case 't':\r
- ENSURE(1);\r
- ret[retlen++] = '\t';\r
- eo++;\r
- break;\r
-\r
- case 'x':\r
- case 'X':\r
- {\r
- /* escaped hexadecimal value (ie. \xff) */\r
- unsigned char v = 0;\r
- int i = 0;\r
-\r
- for (;;) {\r
- eo++;\r
- if (cfg->proxy_telnet_command[eo] >= '0' &&\r
- cfg->proxy_telnet_command[eo] <= '9')\r
- v += cfg->proxy_telnet_command[eo] - '0';\r
- else if (cfg->proxy_telnet_command[eo] >= 'a' &&\r
- cfg->proxy_telnet_command[eo] <= 'f')\r
- v += cfg->proxy_telnet_command[eo] - 'a' + 10;\r
- else if (cfg->proxy_telnet_command[eo] >= 'A' &&\r
- cfg->proxy_telnet_command[eo] <= 'F')\r
- v += cfg->proxy_telnet_command[eo] - 'A' + 10;\r
- else {\r
- /* non hex character, so we abort and just\r
- * send the whole thing unescaped (including \x)\r
- */\r
- ENSURE(1);\r
- ret[retlen++] = '\\';\r
- eo = so + 1;\r
- break;\r
- }\r
-\r
- /* we only extract two hex characters */\r
- if (i == 1) {\r
- ENSURE(1);\r
- ret[retlen++] = v;\r
- eo++;\r
- break;\r
- }\r
-\r
- i++;\r
- v <<= 4;\r
- }\r
- }\r
- break;\r
-\r
- default:\r
- ENSURE(2);\r
- memcpy(ret+retlen, cfg->proxy_telnet_command + so, 2);\r
- retlen += 2;\r
- eo++;\r
- break;\r
- }\r
- } else {\r
-\r
- /* % escape. we recognize %%, %host, %port, %user, %pass.\r
- * %proxyhost, %proxyport. Anything else we just send\r
- * unescaped (including the %).\r
- */\r
-\r
- if (cfg->proxy_telnet_command[eo] == '%') {\r
- ENSURE(1);\r
- ret[retlen++] = '%';\r
- eo++;\r
- }\r
- else if (strnicmp(cfg->proxy_telnet_command + eo,\r
- "host", 4) == 0) {\r
- char dest[512];\r
- int destlen;\r
- sk_getaddr(addr, dest, lenof(dest));\r
- destlen = strlen(dest);\r
- ENSURE(destlen);\r
- memcpy(ret+retlen, dest, destlen);\r
- retlen += destlen;\r
- eo += 4;\r
- }\r
- else if (strnicmp(cfg->proxy_telnet_command + eo,\r
- "port", 4) == 0) {\r
- char portstr[8], portlen;\r
- portlen = sprintf(portstr, "%i", port);\r
- ENSURE(portlen);\r
- memcpy(ret + retlen, portstr, portlen);\r
- retlen += portlen;\r
- eo += 4;\r
- }\r
- else if (strnicmp(cfg->proxy_telnet_command + eo,\r
- "user", 4) == 0) {\r
- int userlen = strlen(cfg->proxy_username);\r
- ENSURE(userlen);\r
- memcpy(ret+retlen, cfg->proxy_username, userlen);\r
- retlen += userlen;\r
- eo += 4;\r
- }\r
- else if (strnicmp(cfg->proxy_telnet_command + eo,\r
- "pass", 4) == 0) {\r
- int passlen = strlen(cfg->proxy_password);\r
- ENSURE(passlen);\r
- memcpy(ret+retlen, cfg->proxy_password, passlen);\r
- retlen += passlen;\r
- eo += 4;\r
- }\r
- else if (strnicmp(cfg->proxy_telnet_command + eo,\r
- "proxyhost", 9) == 0) {\r
- int phlen = strlen(cfg->proxy_host);\r
- ENSURE(phlen);\r
- memcpy(ret+retlen, cfg->proxy_host, phlen);\r
- retlen += phlen;\r
- eo += 9;\r
- }\r
- else if (strnicmp(cfg->proxy_telnet_command + eo,\r
- "proxyport", 9) == 0) {\r
- char pport[50];\r
- int pplen;\r
- sprintf(pport, "%d", cfg->proxy_port);\r
- pplen = strlen(pport);\r
- ENSURE(pplen);\r
- memcpy(ret+retlen, pport, pplen);\r
- retlen += pplen;\r
- eo += 9;\r
- }\r
- else {\r
- /* we don't escape this, so send the % now, and\r
- * don't advance eo, so that we'll consider the\r
- * text immediately following the % as unescaped.\r
- */\r
- ENSURE(1);\r
- ret[retlen++] = '%';\r
- }\r
- }\r
-\r
- /* resume scanning for additional escapes after this one. */\r
- so = eo;\r
- }\r
-\r
- /* if there is any unescaped text at the end of the line, send it */\r
- if (eo != so) {\r
- ENSURE(eo - so);\r
- memcpy(ret + retlen, cfg->proxy_telnet_command + so, eo - so);\r
- retlen += eo - so;\r
- }\r
-\r
- ENSURE(1);\r
- ret[retlen] = '\0';\r
- return ret;\r
-\r
-#undef ENSURE\r
-}\r
-\r
-int proxy_telnet_negotiate (Proxy_Socket p, int change)\r
-{\r
- if (p->state == PROXY_CHANGE_NEW) {\r
- char *formatted_cmd;\r
-\r
- formatted_cmd = format_telnet_command(p->remote_addr, p->remote_port,\r
- &p->cfg);\r
-\r
- sk_write(p->sub_socket, formatted_cmd, strlen(formatted_cmd));\r
- sfree(formatted_cmd);\r
-\r
- p->state = 1;\r
- return 0;\r
- }\r
-\r
- if (change == PROXY_CHANGE_CLOSING) {\r
- /* if our proxy negotiation process involves closing and opening\r
- * new sockets, then we would want to intercept this closing\r
- * callback when we were expecting it. if we aren't anticipating\r
- * a socket close, then some error must have occurred. we'll\r
- * just pass those errors up to the backend.\r
- */\r
- return plug_closing(p->plug, p->closing_error_msg,\r
- p->closing_error_code,\r
- p->closing_calling_back);\r
- }\r
-\r
- if (change == PROXY_CHANGE_SENT) {\r
- /* some (or all) of what we wrote to the proxy was sent.\r
- * we don't do anything new, however, until we receive the\r
- * proxy's response. we might want to set a timer so we can\r
- * timeout the proxy negotiation after a while...\r
- */\r
- return 0;\r
- }\r
-\r
- if (change == PROXY_CHANGE_ACCEPTING) {\r
- /* we should _never_ see this, as we are using our socket to\r
- * connect to a proxy, not accepting inbound connections.\r
- * what should we do? close the socket with an appropriate\r
- * error message?\r
- */\r
- return plug_accepting(p->plug, p->accepting_sock);\r
- }\r
-\r
- if (change == PROXY_CHANGE_RECEIVE) {\r
- /* we have received data from the underlying socket, which\r
- * we'll need to parse, process, and respond to appropriately.\r
- */\r
-\r
- /* we're done */\r
- proxy_activate(p);\r
- /* proxy activate will have dealt with\r
- * whatever is left of the buffer */\r
- return 1;\r
- }\r
-\r
- plug_closing(p->plug, "Proxy error: Unexpected proxy error",\r
- PROXY_ERROR_UNEXPECTED, 0);\r
- return 1;\r
-}\r
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